| 摘要 |
PURPOSE:To prevent a molded object from occurring of inner defect, while the position of a turning interior mold is stabilized by a method in which while a mouth mold is provided movably on a base body of a movable mold, the crank ring connected to the turning interior mold through a parallel link is provided turnably. CONSTITUTION:When a U shape-pipe P is injection molded, a movable mold 13 is moved to a stationary mold 11. Both turning interior molds 15 are inserted into the innermost - of the recessed part 12 of the U shape-mold of the stationary mold, and its tip-surface is butted. The tip surfaces of both mouth molds 14, 14 are respectively placed oppositely to the rear end-surfaces of both turning interior molds 15, 15. When the molding of the U shape-pipe P is finished, first the mouth mold 14 is moved on a base body 16 in such a direction that it is separated from the stationary mold 11, and the rear end of the base part 14a of the mouth mold 14 is brought in contact with the arc-surface of a crank ring 17. When the mouth mold 14 is further moved from said position, the crank ring 17 is turned with the movement of the mouth mold 14, and the turning interior mold 15 is turned to the angle where it may be drawn through a parallel link 20. Successively the mouth mold 14 and the turning interior mold 15 may be drawn from the inner part of a molded object by linearly moving the whole movable mold 13 with the base body 16 in drawing direction. |
